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►▼oxygen[Edit] : A gaseous chemical element with symbol O and atomic number 8; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume.
(Source: MGH)

A gaseous chemical element with symbol O and atomic number 8; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume.
(Source: MGH)